John 5:47 - Ellicott's Commentary On The Whole Bible

The emphasis of the contrast here is not between “writings” and “words,” but between “his” and “My.” It is a repetition of the thought of the previous verse, with an advance in time. They had not believed Moses, and therefore had not believed Him. They do not believe, for they do not read the spiritual meaning of the writings of Moses even now. What ground of hope is left? His words, revealing the deeper truths of the kingdom of God, will fall upon their ears as so many unmeaning sounds. (Comp. Note on John 3:12.)